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[553]

Started w dry system after replacing a caliper banjo bolt, can't build much pressure but no bubbles (hear the discs creak a bit). Used a harbour freight vacuum bleeder to get it started then bled the MC etc by hand all day yesterday.

Ran a line to a nipple from the reservoir and pumped until fluid was pumping into the res. Been tapping on the lines.

Tried pushing fluid through one side with syringe. On other side most of the fluid leaked out the caliper banjo bleeder not sure if it worked. Tried using the syringe to vacuum bleed. Replaced MC crush washers. Replaced a bleed screw and put grease on the threads. Left rubber band on the lever and reservoir cracked open over night.

[RocketDan]

Did it have good pressure before you replaced the banjo bolt?

And it makes some brake pressure just not a lot of pressure? When you pump the brakes will the pressure increase or does it always keep the same amount of pressure?


Daniel
OTP Racing #14
Yamaha R1
Wilmington, NC

[553]

Did it have good pressure before you replaced the banjo bolt?

And it makes some brake pressure just not a lot of pressure? When you pump the brakes will the pressure increase or does it always keep the same amount of pressure?


Daniel
OTP Racing #14
Yamaha R1
Wilmington, NC

Looks to be the RH bleeder, when I pack grease on the threads its moves more fluid temporarily. Anyone happen to have a caliper? Ive tried the old bleeder again and the newer one was 1 yr old.

Brakes were great before, and I get pressure. When I pump pressure stays the same.

[553]

Actually doesn't seem like the bleeder, teflon had no effect on it.  Also when I start to bleed sometimes it builds up a bit of pressure, then as I continue the pressure drops off.

[RocketDan]

Hmmmm

Hard to say without looking at it.

When you tighten the bleeder it still won’t hold pressure?

I’m not great with the vacuum blower systems. I usually close the bleeders. Pump the pressure up. Then I pump and hold the lever, loosen the bleeder which pushes the air out, all while holding the lever. Tighten the bleeder and pump the lever again until it has pressure. Repeat until air is gone. Usually have to keep adding fluid to the reservoir during this process.


Daniel
OTP Racing #14
Yamaha R1
Wilmington, NC

[553]

Well I managed to get a little power by using slow short strokes at MC but its lost eventually when trying to bleed at the calipers, one side specifically. Gonna wait and see if it leaks over time.

Is a symptom of a bad MC that the pressure drops off at a certain point in the travel? I feel the lever either reach the point in travel or pressure where the air compresses or the MC is leaking.

[RocketDan]

It could be a bad MC. Or could just be air in the lines.

The fact it was working before you changed the banjo bolt leads me to think it’s just air in the line.


Daniel
OTP Racing #14
Yamaha R1
Wilmington, NC

[553]

Swapped the MC, feels the same. Also got a proper syringe to reverse bleed but I get a lot of leakage through the threads.

Would Maxspeed carry a single banjo bolt with bleeder M10x1.25? Maybe the one I bought leaks.

[52 Ruhe]

Is this a speed bleeder you are trying to reverse flow with the syringe?
And really
Only need to crack that bleeder like 1/4 or perhaps half a turn.

[553]

Is this a speed bleeder you are trying to reverse flow with the syringe?
And really
Only need to crack that bleeder like 1/4 or perhaps half a turn.

I switched bleeders, also just picked up new bleeders. Only things ive noticed, the bleeder has some play up/down when fluid flows at 1/8 turn out or less. Also can't get much fluid off of that side at all. This is weird, the vacuum bleeder on this side only pulls bubbles towards the bleeder. Opposite to the other side.

Removed the new banjo bleeder and just bled using the caliper bolt. Now everything is new except that and the crush washers on the side that haven't been moved.

Does anyone rent bikes? I booked the 3 days and my street bike just had issues too.

[Redrocks]

Hey if you would like to make your money back for Saturday I’ll buy the day from you if you are in B group. I’m already here. Set up at the end of the parking lot before you go into the gravel lot.

[Redrocks]

Sorry, I mean intermediate group. I keep calling it B but that’s confusing.

[dansvs]

I realize this thread has some time on it. Hope you found your problem.
I had a similar problem with my SV. I cleared it by removing the calipers and squeezing the lever to extend the caliper pistons a little
then back seating the pistons which forced the air in the master back to the reservoir.